On Fri, Feb 01, 2013 at 05:45:29PM +0000, Arnd Bergmann wrote:

Yes, that was my point. I think in this case, the bug is in the new
of_pci_process_ranges functions, which returns a 'struct resource'
translated into IORESOURCE_MEM space, but with the type set
to IORESOURCE_IO. This resource then gets passed to 
pci_add_resource_offset().

A standard way to express the required address translation from CPU
physical address to IO bus address might help other people avoid this
trap??

Jason